Pitman-holder.



No. 666,794. Patented Ian. 29, MIL

E. J. BIBKETT. PITMA' N HOLDER.

(Application filed June 7, 1900.)

(No Modal.)

I/MMQ Edward JET/M.

TN: "ORRAS Finns cu. PMoYo-l.lfn0.. WASRINGTON. u. c,

UNITED STATES PATENT OFFICE.

EDWARD J. BIRKETT, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE MILWAUKEE HARVESTER COMPANY, OF SAME PLACE.

PlTMAN-HOLDER.

SPECIFICATION forming part of Letters Patent No. 666,794, dated January 29, 1901.

Application filed June '7, 1900. Serial No. 19,421. (No model.)

To all whom it may concern: I

Be it known that I, EDWARD J. BIRKETT, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Pitman-Holders, of which the following is a specification.

My invention relates to improvements in pitman connections for harvesters and mowers; and the object of my improvement is to provide a pitman connection that may be readily disconnected without the use of tools and one that will securely retain the parts in connection when so adjusted. I attain this object by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a plan view, partly in section, of my invention. Figs. 2, 3, 4, and 5 are representations in detail of the difierent opera- 2o tive part-s.

Like numerals refer to like parts throughout the several figures.

1 is the crank. It may be a crank-Wheel. 2 is the wrist-pin. It is formed with a tubular 2 5 bore 3, which may extend entirely through the crank. The bore at its outer end is partly closed by means of the bridge 4. 5 is a retaining-key having the stem portion 6 adapted to enter the bore 3 and the collar portion 0 7 of greater diameter than the wrist-pin 1.

An opening 8 is made through the larger end of the key, and upon each side of the opening are small cars 9, projecting outward from its face, and a plate-spring 10 is secured to the 5 key, leaving its free end projecting through the opening 8. The plate-spring 10 has an offset 11, adapted to engage with the bridge 4 of the wrist-pin, and the ribbed sides 12 of the key rest against the bridge and prevent the key from revolving within the Wrist-pin.

The cars 9 are designed to shield the projecting end of the spring. The same mode of construction is employed in connecting the opposite end of the pitman to the sickle-head.

The sickle-head is provided with a pin corpin. The retaining-key is pushed into the bore of the wrist-pin. The plate-spring yields under the pressure until the offset portion has reached a position inside of the bridge 4:, when it reacts and causes the ofiset to engage with the bridge, and the collar being of greater diameter than the wrist-pin holds the pitman securely against lateral displacement.

My invention is applicable to all mechanisms employing pitmen with wrist-pin connections and is especially designed to facilitate the removal-of the pitman of a harvester or mower cutting apparatus, which is frequently necessaryin order that the sickle may be withdrawn.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a pitman connection, the combination of a pitman, a wrist-pin and a retaining-key, said wrist-pin having a central longitudinal bore adapted to receive the retaining-key, a plate-spring having an offset, and said wristpin provided with a bridge portion extending across one end of the longitudinal bore, and adapted to engage with the offset portion of the spring.

2. A pitman-retaining key adapted to enter an axial bore of a wrist-pin, and provided with a head having a greater diameter than the wrist-pin, and an opening through the head, and a plate-spring having one end secured to the key, and its free end projecting through the opening, said spring having an offset adapted to engage with the Wrist-pin.

3. In a pitman connection, a wrist-pin and a pitman in combination therewith,said Wristpin having an axial bore adapted to receive a'pitman-retaining key, and having a bridge across one end of the bore.

4.. In a pitman and sickle-head connection, the combination of a sickle-head having a stem adapted to receive a pitman, said stem having an axial bore adapted to receive a retaining-key, and means within said stem for holding the key against lateral displacement.

EDWARD J. BIRKETT.

Witnesses:

E. W. BURGESS, B. C. WAIT. 

